I notice that there are something wrong with my access_log. The first item in each record should be the ip of remote client. But in my log, it is always 127.0.0.1. There is also another copy of access_log in /var/log/httpd/access_log, which records the right ip address.

The other thing is about the log file in another machine. it seems that the module doesn't execute at all. That apache server is quite strange. Even if I type in some non-existing module in the httpd.conf. It
wont' give any error. I dont' know how to get it work in this case.